Abstract: In order to construct the combination model of farming and breeding, to utilize the biogas-slurry produced by livestock breeding industry, and to determine the effect of this model on feeding quality composition of barley, a study on correlation between main traits and feeding quality indexes of the barley variety of Supi No. 8 under biogas-slurry returning to field mode was carried out in .liangsu coastal area. The results showed that the height of Supi No. 8 was significantly positively correlated with the biomass, and effects of height, ratio of stem and leaf as well as dry matter content on biomass reached up to 88.0%; the moisture content, total starch content, thousand-grain weight, and plot grain yield were significantly or extremely significantly positively （or negatively） correlated with grain protein content, and the impact reached up to 95.9%; in the whole-plant feeding quality analysis of Supi No. 8, the content of crude ash, crude fiber, neutral washing fiber and acidic washing fiber were closely related to the linear relationship of the crude protein content, and the effect reached 70.0%. This study indicated that the barley variety of Supi No. 8 had a great feeding potential under biogas-slurry returning to field model, and the apparent indexes such as plant height and yield could be used to estimate the feeding value and guide the production management.